I'm seeing much brighter magnitudes posted visually than 13-14...
pasted from the Yahoo CometObs group
C/2012S1 (ISON)
2013 Oct 27.16 UT: m1=10.0, Dia.= ~4' DC=2; 80x200L; Alex Scholten
(Eerbeek, Netherlands) (possible underestimated due to moonlight, Last
Quarter)
C/2012 S1 (ISON):
2013 Oct. 29.18 UT: m1= 9.7, Dia=4.0', DC=4, tail 0.2deg. in PA 300,
40.7-cm L (58x); Nicolas Biver, Ablis, France
C/2012 S1 ISON
2013 Oct. 28.31 UT: m= 10.0:,...18cm L (57x)...Alexandre Amorim(Florianopolis,Brazil)[altitude 19 degrees, nautical twilight, moonligh interference]
Leia e Conheça
"O Astrônomo Brazilício"
http://www.costeira1.rg10.net